diff --git a/setup.py b/setup.py
index 998c192a..dd6d8f2f 100644
--- a/setup.py
+++ b/setup.py
@@ -83,6 +83,7 @@ setup(
     install_requires = [
         "parsedatetime>=1.2",
         "pytz>=2013b",
+        "PyYAML>=3.11",
         "six>=1.6.1",
         "tzlocal>=1.1",
         "keyring>=3.3",